CN102367835A - Self-lubricating oscillating bearing and manufacturing method thereof - Google Patents
Self-lubricating oscillating bearing and manufacturing method thereof Download PDFInfo
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- CN102367835A CN102367835A CN2011102288768A CN201110228876A CN102367835A CN 102367835 A CN102367835 A CN 102367835A CN 2011102288768 A CN2011102288768 A CN 2011102288768A CN 201110228876 A CN201110228876 A CN 201110228876A CN 102367835 A CN102367835 A CN 102367835A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/046—Brasses; Bushes; Linings divided or split, e.g. half-bearings or rolled sleeves
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- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a self-lubricating oscillating bearing and a manufacturing method thereof. The manufacturing method comprises the following steps of preparing two outer semirings, wherein inner revolution surfaces of the two outer semirings are provided with spherical surface parts and two raised rings, oppositely and fixedly connecting the two outer semirings so that shaft end surfaces of the two raised rings contact to form check ring positions, casting out gasket parts of the spherical surface parts of the two outer semirings by a centrifugation casting method, wherein the gasket parts cover the check ring positions, processing inner revolution surfaces of the gasket parts to enable each one of the gasket parts to be divided into two gaskets respectively located at two sides of the check ring position, splitting the two outer semirings, processing assembling grooves on friction surfaces of the gaskets, inlaying and fixing self-lubricating material pieces in the assembling grooves, assembling inner rings in the two outer semirings, and oppositely and fixedly connecting the two outer semirings.
Description
Technical field
The present invention relates to a kind of self-lubricating knuckle bearing and production method thereof.
Background technique
Existing self-lubricating knuckle bearing, as adopting the bearing of Cuprum alloy as lubricated liner, this Cuprum alloy has the advantage of intensity height, high lubricating effect, is that example describes below with the Cuprum alloy.Existing employing is inlayed lubricated liner is fixed on sphere within the joint shaft bearing, and its structural type and production method have following several kinds basically:
A kind of is to adopt the method for casting to cast out integral body for the joint shaft bearing outer ring or the inner ring of Cuprum alloy, and after machining, even cloth hole is embedded in solid self lubricant material in the hole on sphere, forms through fine finishing again.It has following shortcoming: because of outer ring or inner ring integral body are Cuprum alloy, waste a large amount of non-ferrous metals, cost is high, bearing capacity is little, erosion-resisting characteristics is poor.
Another kind is that Cuprum alloy is passed through sintering on steel plate, forms bimetal plate, through repeatedly rolling and stress-removal processing, processes the very little composite board of hole, rolls to be installed on the friction sphere again.It has following shortcoming: assembly reliability is poor, position, complex structure are slided in easy generation when using, technology is cumbersome, cost is high, is not suitable for making large-scale plain radial bearing.
To the appeal shortcoming, reveal following at present two kinds of solutions:
Adopt the method for electric arc spraying on the bearing outer ring inner ball surface, to spray the layer of copper alloy-layer, it has following deficiency: the copper alloy layer hole that electric arc spraying produces is big, and intensity is low, needs in hole, to fill aquadag, needs through rolling or the vacuum impregnation filling pore.
With outer ring inner ball surface built-up welding layer of copper alloy-layer, it has following deficiency: in the process of electric arc spraying, be local heating, it is more inhomogeneous to be heated, and is easy to generate stress with overlaying method, therefore in the postchannel process of processing, will carry out stress and handle.
Summary of the invention
The invention provides a kind of self-lubricating knuckle bearing and production method thereof, it has overcome self-lubricating knuckle bearing and the existing deficiency of production method thereof in the background technique.
One of technological scheme that is adopted that the present invention solves its technical problem is:
A kind of self-lubricating knuckle bearing, it comprises:
One outer ring (100); It comprises two semi outer rings (110); Said semi outer rings (110) has outer turning surface and interior turning surface; Turning surface has the protruding ring (112) that a land portions (111) and is positioned at land portions (111) large-diameter end at least in said, and said two semi outer rings (110) form the back-up ring position in the face of being fixed together so that two semi outer rings (110) protruding rings (112) axial end abuts against together; Said two semi outer rings (110) land portions (111) all are lined with liner (120) admittedly; Be arranged with a plurality of fitting recess (121) from said liner (120) rubbing surface, inlay solid self lubricant material spare (122) in the said fitting recess (121), and said protruding ring (112) highly is no less than liner (120) thickness; And
One inner ring (200), it is installed in the outer ring (100), and cooperates liner (120) rubbing surface and self lubricating material spare (122).
Among one preferred embodiment: said fitting recess (121) is a blind hole.
Among one preferred embodiment: said self lubricating material spare (122) is the self lubricating material post.
Among one preferred embodiment: the regularly arranged layout of said a plurality of fitting recess (121).
Among one preferred embodiment: said fitting recess (121) comprises that one runs through the groove that groove and is arranged with semi outer rings (110) land portions (111) of liner (120), saidly runs through the groove port and the groove port is adaptive.
The present invention solve its technical problem the technological scheme that is adopted two be:
A kind of self-lubricating knuckle bearing production method, it is characterized in that: it comprises:
Step 1; Be used to prepare two semi outer rings (110); Said semi outer rings (110) has outer turning surface and interior turning surface; Turning surface has the protruding ring (112) that a land portions (111) and is positioned at land portions (111) large-diameter end at least in said, again two semi outer rings (110) is formed the back-up ring position in the face of being fixed together so that two semi outer rings (110) protruding rings (112) axial end abuts against together;
Step 2 is used for casting out liner part (120 ') through centre spinning method in two semi outer rings (110) land portions (111), and said liner part (120 ') is flooded the back-up ring position;
Step 3; Be used to process the interior turning surface of liner part (120 ') and separated liner (120) by the back-up ring position respectively in two sides so that liner part (120 ') processing is divided into two; Said two liners (120) rubbing surface is processed into land portions; Said liner (120) thickness is not more than protruding ring (112) highly, splits two outer rings (110) again;
Step 4 is used for being arranged with processing and assembling groove (121) from liner (120) rubbing surface;
Step 5 is used on fitting recess (121), inlaying fixedly self lubricating material spare (122);
Step 6 is used for inner ring (200) is fitted in two semi outer rings (110), two semi outer rings (110) is faced to be fixed together again.
Among one preferred embodiment: said step 5 comprises:
Step 51 is used on fitting recess (121), inlaying fixedly self lubricating material spare (122);
Step 52 is used for two semi outer rings (110) in the face of being fixed together, and fine finishing semi outer rings (110) carries out friction coat then and handles to finished size again;
Step 53 splits two semi outer rings (110).
Among one preferred embodiment: said step 4 comprises:
Step 41 is used at liner (120) rubbing surface processing and assembling groove (121);
Step 42 is used for heat treatment outer ring (110).
Among one preferred embodiment: also comprise before the said step 41:
Step 40 is used for the interior turning surface of fine finishing liner (120).
The present technique scheme is compared with background technique, and it has following advantage:
1, the structure of semi outer rings internal projection ring and size and liner centrifugal casting processing mode are cooperated; Then can overcome the existing deficiency of background technique; And can produce following technique effect: a, because the existence of protruding ring; Therefore can liner part be machined as the liner of two separation, two outer rings split fast convenient, and product percent of pass is high after splitting; B, a large amount of liner metal of saving are saved a large amount of rare metals, reduce cost, and improve cost performance of product; C, structural strength are high, bearing capacity is big, anti-impact force is strong, hang down friction, selflubricating, wear-resistant; D, the large-scale and super-huge self-lubricating plain radial bearing of suitable manufacturing;
2, fitting recess comprises that one runs through the groove that groove and is arranged with the semi outer rings land portions of liner, runs through the groove port and the groove port is adaptive, then assembles the rear stability height;
3, at inner ball surface spun casting one deck self lubricating material liner of the outer ring of bearing, carry out machining again, cast layer and surface, outer ring are molten state, and contact firmly; The liner inner ball surface also can be reprocessed at last, and surface accuracy is better, and saves the Cu alloy material use amount, and the rare metal that processes can utilize again.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is the structure sectional view of self-lubricating plain radial bearing of the present invention.
Fig. 2 is schematic representation before the liner spun casting of self-lubricating plain radial bearing of the present invention outer ring.
Fig. 3 is schematic representation after the self-lubricating plain radial bearing liner of the present invention spun casting.
Fig. 4 for inner ball surface roughing after the self-lubricating plain radial bearing liner of the present invention spun casting after schematic representation.
Fig. 5 for self-lubricating plain radial bearing of the present invention scheme outward solid self lubricant material spare blind hole bore good after, schematic representation before solid self lubricant material is filled.
Fig. 6 fills the back schematic representation for self-lubricating plain radial bearing of the present invention outer ring solid self lubricant material.
Fig. 7 is the complete back of processing, self-lubricating plain radial bearing of the present invention outer ring sectional view.
Embodiment
Please refer to Fig. 1, the present invention's self-lubricating plain radial bearing comprises an outer ring 100 and an inner ring 200.
Said outer ring 100; It comprises two semi outer rings 110; Said semi outer rings 110 has turning surface in an outer turning surface and, and said outer turning surface comprises a cylinder at least, and said interior turning surface has the protruding ring 112 that a land portions 111 and is positioned at land portions 111 large-diameter end at least.Said two semi outer rings 110 form the back-up ring position in the face of being fixed together so that two semi outer rings, 110 protruding rings, 112 axial end abut against together; So that two semi outer rings, 110 axial end are in the face of abutting against together; Among the present embodiment, said affixedly for example adopt: offer fixed hole at semi outer rings 110, set screw 130 pass two fixed holes with two semi outer rings 110 in the face of being fixed together; But, also can adopt other mode of structure as required not as limit.Said two semi outer rings, 110 land portions 111 all are lined with liner 120 admittedly, are drilled with a plurality of fitting recess 121 from said liner 120 rubbing surfaces, inlay solid self lubricant material spare 122 in the said fitting recess 121, and said protruding ring 112 highly are no less than liner 120 thickness.Among the present embodiment, said fitting recess 121 comprises that one runs through the groove that groove and is arranged with semi outer rings 110 land portions 111 of liner 120, saidly runs through the groove port and the groove port is adaptive, saidly runs through groove and groove fit forms blind hole.Among the present embodiment, said a plurality of fitting recess 121 regularly arranged layouts, said self lubricating material spare 122 is the self lubricating material post, the area of said solid self lubricant material post accounts for 15%～25% of pivot friction area.
Said inner ring 200, it is installed in the outer ring 100, makes said inner ring 200 outer turning surface cooperate liner 120 rubbing surfaces and self lubricating material spare 122.
Among the present embodiment, said outer ring, inner ring are all selected steel material for use, and said liner is selected Cuprum alloy for use, and the friction pair that forms between said Cuprum alloy and the steel can be realized the non-maintaining function of selflubricating.Among the present embodiment, said interior loop material is structural carbon steel or Bearing Steel, again through quenching, but the sphere hard chromium plating.Outside the characteristic that the existing outer ring of the present invention base steel material structural strength is high, bearing capacity is big, anti-impact force is strong, the low friction characteristics as the Cu alloy material of friction pair are arranged again, have selflubricating, wear-resisting advantage and be inlaid with solid self lubricant material.
The concrete machining process of above-mentioned self-lubricating plain radial bearing is following:
Step 1; As enclose shown in 2; Select for use the steel of corresponding structural carbon steel or Bearing Steel or respective performances to make the bearing outer ring forging stock by required specification, each outer ring is with two forging stocks, and rough forging stock becomes external diameter, interior sphere diameter and highly can meet the requirements of the semi outer rings 110 of size and precision; Said semi outer rings 110 has turning surface in an outer turning surface and; Turning surface has the protruding ring 112 that a land portions 111 and is positioned at land portions 111 large-diameter end at least in said; Through screw 130 with two semi outer rings 110 in the face of being fixed together so that two semi outer rings, 110 axial end in the face of being close together admittedly, two protruding rings, 112 axial end being abutted against form the back-up ring position together;
Step 2, as shown in Figure 3, selecting high-abrasive material for use is the Cuprum alloy of CuZn24Al6Mn3Fe3; Through centre spinning method the Cuprum alloy of molten state is cast to two semi outer rings, 110 land portions 111 after the preheating, the liquid copper alloy after the casting contacts rotation with the outer ring, and two kinds of metals fully diffuse to form transition layer; The mating face is molten state, and natural cooling then is to cast out liner part 120 '; Said liner part 120 ' is flooded the back-up ring position, that is to say that Cuprum alloy thickness is not less than back-up ring position height;
Step 3; As shown in Figure 4, be used in the Vehicle Processing liner part 120 ' turning surface so that unnecessary copper alloy layer car is fallen, the back-up ring position 112 interior turning surface end faces of width central position, car to outer ring are (among the present embodiment; That is to say that Vehicle Processing is to steel); With liner part 120 ' is processed as two by back-up ring position 112 separate two sides liner 120, said two liners, 120 rubbing surfaces are land portions, said liner 120 thickness are not more than protruding ring 112 height; Pull down screw 130 again, to split two outer rings 110;
Step 4 is used for being arranged with processing and assembling groove 121 from liner 120 rubbing surfaces, specifically comprises:
Step 40 is used for turning surface in the fine finishing liner 120;
Step 41, as enclose shown in 5, be used for being arranged with fitting recess 121 at liner 120 rubbing surfaces; Specifically, go up the blind hole 121 that the processing rule is arranged in liner 120 inner ball surface (rubbing surface), hole depth is decided according to design demand, and the area sum in hole will account for 15%～25% of whole outer ring inner ball surface area, carries out the tempering stabilization then;
Step 42 is used for heat treatment outer ring 110;
Step 5 is used on fitting recess 121, inlaying fixedly self lubricating material spare 122; Can comprise specifically:
Step 51 is used on fitting recess 121, inlaying fixedly self lubricating material spare 122;
Step 52 is used for through screw 130 two semi outer rings 110 in the face of being fixed together, and semi finishing again, fine finishing semi outer rings 110 carry out friction coat then and handle to finished size;
Step 53 splits two semi outer rings 110.
Step 6 is used for inner ring 200 is fitted into two semi outer rings 11) in, through screw 130 two semi outer rings 110 are faced again and be fixed together the processing of completion bearing of the present invention.
Among the present invention: the liner of outer ring inner ball surface is to adopt centrifugally cast method that Cuprum alloy is cast on the inner ball surface of outer ring, again the outer ring inner ball surface is carried out machining, reaches desired size; Cast layer contacts firmly with surface, outer ring, outer ring, and inner ball surface has reprocessing at last, and surface accuracy is good; Can save the Cuprum alloy use amount; Can save a large amount of rare metals, reduce cost, improve cost performance of product; Product of the present invention is applicable at various heavy duties, low speed and is difficult to form under the lubricant film operating mode, like engineering machinery, mine metallurgical machinery, Hoisting Machinery and large-scale hydraulic engineering etc.
Among the present invention: press the product that such scheme is made, the adhesive strength of outer ring and Cuprum alloy is up to more than the 100MPa, and adhesive strength >=50MPa just can satisfy usage requirement under normal conditions; Cuprum alloy thickness can be decided according to design demand, is that the joint shaft bearing outer ring or the inner ring of Cuprum alloy compared with integral body, can save the nonferrous materials more than 70%.
The above is merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (9)
1. self-lubricating knuckle bearing, it is characterized in that: it comprises:
One outer ring (100); It comprises two semi outer rings (110); Said semi outer rings (110) has outer turning surface and interior turning surface; Turning surface has the protruding ring (112) that a land portions (111) and is positioned at land portions (111) large-diameter end at least in said, and said two semi outer rings (110) form the back-up ring position in the face of being fixed together so that two semi outer rings (110) protruding rings (112) axial end abuts against together; Said two semi outer rings (110) land portions (111) all are lined with liner (120) admittedly; Be arranged with a plurality of fitting recess (121) from said liner (120) rubbing surface, inlay solid self lubricant material spare (122) in the said fitting recess (121), and the highly no more than liner of said protruding ring (112) (120) thickness; And
One inner ring (200), it is installed in the outer ring (100), and cooperates liner (120) rubbing surface and self lubricating material spare (122).
2. want 1 described a kind of self-lubricating knuckle bearing according to right, it is characterized in that: said fitting recess (121) is blind hole.
3. a kind of self-lubricating knuckle bearing according to claim 1 is characterized in that: said self lubricating material spare (122) is the self lubricating material post.
4. a kind of self-lubricating knuckle bearing according to claim 1 is characterized in that: the regularly arranged layout of said a plurality of fitting recess (121).
5. a kind of self-lubricating knuckle bearing according to claim 1; It is characterized in that: said fitting recess (121) comprises that one runs through the groove that groove and is arranged with semi outer rings (110) land portions (111) of liner (120), saidly runs through the groove port and the groove port is adaptive.
6. self-lubricating knuckle bearing production method, it is characterized in that: it comprises:
Step 1; Be used to prepare two semi outer rings (110); Said semi outer rings (110) has outer turning surface and interior turning surface; Turning surface has the protruding ring (112) that a land portions (111) and is positioned at land portions (111) large-diameter end at least in said, again two semi outer rings (110) is formed the back-up ring position in the face of being fixed together so that two semi outer rings (110) protruding rings (112) axial end abuts against together;
Step 2 is used for casting out liner part (120 ') through centre spinning method in two semi outer rings (110) land portions (111), and said liner part (120 ') is flooded the back-up ring position;
Step 3; Be used to process the interior turning surface of liner part (120 ') and separated liner (120) by the back-up ring position respectively in two sides so that liner part (120 ') processing is divided into two; Said two liners (120) rubbing surface is processed into land portions; Said liner (120) thickness is not more than protruding ring (112) highly, splits two outer rings (110) again;
Step 4 is used for being arranged with processing and assembling groove (121) from liner (120) rubbing surface;
Step 5 is used on fitting recess (121), inlaying fixedly self lubricating material spare (122);
Step 6 is used for inner ring (200) is fitted in two semi outer rings (110), two semi outer rings (110) is faced to be fixed together again.
7. a kind of self-lubricating knuckle bearing production method according to claim 6, it is characterized in that: said step 5 comprises:
Step 51 is used on fitting recess (121), inlaying fixedly self lubricating material spare (122);
Step 52 is used for two semi outer rings (110) in the face of being fixed together, and fine finishing semi outer rings (110) carries out friction coat then and handles to finished size again;
Step 53 splits two semi outer rings (110).
8. a kind of self-lubricating knuckle bearing production method according to claim 6, it is characterized in that: said step 4 comprises:
Step 41 is used at liner (120) rubbing surface processing and assembling groove (121);
Step 42 is used for heat treatment outer ring (110).
9. a kind of self-lubricating knuckle bearing production method according to claim 8 is characterized in that: also comprise before the said step 41:
Step 40 is used for the interior turning surface of fine finishing liner (120).
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| CN2011102288768A CN102367835B (en) | 2011-08-10 | 2011-08-10 | Self-lubricating joint bearing and manufacturing method thereof |
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| CN2011102288768A CN102367835B (en) | 2011-08-10 | 2011-08-10 | Self-lubricating joint bearing and manufacturing method thereof |
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| CN102367835A true CN102367835A (en) | 2012-03-07 |
| CN102367835B CN102367835B (en) | 2013-01-23 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105172825A (en) * | 2015-09-25 | 2015-12-23 | 福建凯斯兰机械工业有限公司 | Self-lubricating anti-impact and anti-corrosion train compartment connecting component |
| CN106089997A (en) * | 2016-08-22 | 2016-11-09 | 怀宁吉利来精密机械科技有限公司 | A kind of manufacturing process of PTFE material water conservancy oscillating bearing |
| CN106969018A (en) * | 2017-03-29 | 2017-07-21 | 上海市轴承技术研究所 | Self-lubricating cone pin and its processing method |
| CN108547860A (en) * | 2018-06-26 | 2018-09-18 | 湖州职业技术学院 | A kind of self-lubricating thrust articulated bearing and its manufacturing method |
| CN109551175A (en) * | 2018-09-27 | 2019-04-02 | 中浙高铁轴承有限公司 | A kind of width temperature range low temperature double semi outer rings self-lubricating knuckle bearing processing technology |
| CN109854618A (en) * | 2019-03-26 | 2019-06-07 | 洛阳新强联回转支承股份有限公司 | A kind of low friction spherical joint bearing of super-large diameter |
| CN111350754A (en) * | 2020-04-16 | 2020-06-30 | 中国航发沈阳发动机研究所 | Joint bearing and assembling method thereof |
| CN111434938A (en) * | 2019-01-11 | 2020-07-21 | 斯凯孚公司 | Sliding bearing with improved wear resistance |
| CN111823019A (en) * | 2020-07-15 | 2020-10-27 | 福建龙溪轴承(集团)股份有限公司 | Radial subdivision and dislocation combined integrated processing technology for radial spherical plain bearing outer ring shaft |
| CN111853055A (en) * | 2020-07-15 | 2020-10-30 | 福建龙溪轴承(集团)股份有限公司 | Axial-radial split type radial spherical plain bearing |
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| CN109404422A (en) * | 2018-11-30 | 2019-03-01 | 江苏希西维轴承有限公司 | A kind of micro- texture Enhancement Method of self-lubricating oscillating bearing liner binding force laser |
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| US4060287A (en) * | 1976-06-30 | 1977-11-29 | Kamatics Corporation | Bearing seal and method of forming same |
| CN2323189Y (en) * | 1998-05-19 | 1999-06-09 | 胡长安 | Solid lubricated bimetal sliding bearing |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105172825A (en) * | 2015-09-25 | 2015-12-23 | 福建凯斯兰机械工业有限公司 | Self-lubricating anti-impact and anti-corrosion train compartment connecting component |
| CN106089997A (en) * | 2016-08-22 | 2016-11-09 | 怀宁吉利来精密机械科技有限公司 | A kind of manufacturing process of PTFE material water conservancy oscillating bearing |
| CN106969018A (en) * | 2017-03-29 | 2017-07-21 | 上海市轴承技术研究所 | Self-lubricating cone pin and its processing method |
| CN108547860A (en) * | 2018-06-26 | 2018-09-18 | 湖州职业技术学院 | A kind of self-lubricating thrust articulated bearing and its manufacturing method |
| CN109551175A (en) * | 2018-09-27 | 2019-04-02 | 中浙高铁轴承有限公司 | A kind of width temperature range low temperature double semi outer rings self-lubricating knuckle bearing processing technology |
| CN111434938A (en) * | 2019-01-11 | 2020-07-21 | 斯凯孚公司 | Sliding bearing with improved wear resistance |
| CN111434938B (en) * | 2019-01-11 | 2023-09-19 | 斯凯孚公司 | Sliding bearing with improved wear resistance |
| CN109854618A (en) * | 2019-03-26 | 2019-06-07 | 洛阳新强联回转支承股份有限公司 | A kind of low friction spherical joint bearing of super-large diameter |
| CN111350754A (en) * | 2020-04-16 | 2020-06-30 | 中国航发沈阳发动机研究所 | Joint bearing and assembling method thereof |
| CN111823019A (en) * | 2020-07-15 | 2020-10-27 | 福建龙溪轴承(集团)股份有限公司 | Radial subdivision and dislocation combined integrated processing technology for radial spherical plain bearing outer ring shaft |
| CN111853055A (en) * | 2020-07-15 | 2020-10-30 | 福建龙溪轴承(集团)股份有限公司 | Axial-radial split type radial spherical plain bearing |
| CN111823019B (en) * | 2020-07-15 | 2022-06-14 | 福建龙溪轴承(集团)股份有限公司 | Radial subdivision dislocation combination integrated machining method for radial spherical plain bearing outer ring shaft |
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